I am thinking of getting a set of performance ignition wires for my 5sfe. Any good suggestions on the which brand I should get? (Most importantly, pls also list out the size of the wires, thx)

stock.

U mean spark plug wires or actual ignition wires?

If you mean spark plugs I would suggest looking into MSD or Nology.. I have had good luck before with both companies... Also look into either the silverstone plugs for the Nology's or Denso Iridiums for the MSD's